TOPIC LOCATION:     `Detail Editor`;    `Object Menu (Detail)`

PRECEDING TOPIC:    `Attributes (Shininess)`
FOLLOWING TOPIC:    `Attributes (Texture)`

Index of Refraction
The Index of Refraction is a measurement of the amount that light bends as
it passes through a particular surface.  This effect can be well
illustrated by the effect of a pencil placed in a glass of water.  In this
case the pencil would appear crooked because of the way light bends as it
passes through the water.  Various surfaces each have their own constant
index of refraction.  For instance:

     Glass     1.66
     Air       1.00
     Water     1.33
     Crystal   2.00
     Salt      1.54
     Quartz    1.55
     Emerald   1.57
     Diamond   2.42

